Mounted Rack apps should have default named routes based on app name #17944
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This fixes a regression in 4.2.0 from 4.1.8, introduced in 4a7b959.
#17823 fixed a similar regression regarding explicitly named routes for a mounted Rack app, but there was another regression for the default value.
With a route like:
The "Prefix" column of rake routes gives the following:
This fixes the default to go back to being based off the name of the class like the docs specify
Explicitly named routes still work correctly per #17823:
/cc @rafaelfranca @tenderlove